Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6687060 | Reading optical system | Makoto Ooki | 2004-02-03 |
| 6275342 | Zoom lens system | Keijiro Sakamoto | 2001-08-14 |
| 5731911 | Zoom lens system | — | 1998-03-24 |
| 5623370 | Gradient index lens system | Toshihiko Ueda, Satoshi Iwasaki, Sanae Watanabe, Keijiro Sakamoto | 1997-04-22 |